Банкомат: выдать указанную сумму максимально крупными купюрами известного достоинства

#include <iostream>
 
class cATM
{
public:
    explicit cATM(int count_50, int count_100, int count_1000)
        : m_count_50(count_50)
        , m_count_100(count_100)
        , m_count_1000(count_1000)
    {}
    bool giveMoney(int cash, int &count_50, int &count_100, int &count_1000)
    {
        return true; // если возможно выдать
        return false; // если невозможно выдать
    }
private:
    int m_count_50 = 0;
    int m_count_100 = 0;
    int m_count_1000 = 0;
};
 
int main()
{
    int ATM_count_50 = 0,
        ATM_count_100 = 0,
        ATM_count_1000 = 0;
    int m_ATM_count_50 = 0,
        m_ATM_count_100 = 0,
        m_ATM_count_1000 = 0;
    int cash = 0;
    std::cout << "ATM cash data: ";
    std::cin >> ATM_count_50 >> ATM_count_100 >> ATM_count_1000;
    std::cout << std::endl;
    cATM atm(ATM_count_50, ATM_count_100, ATM_count_1000);
 
    std::cout << "Enter the amount to issue: "; std::cin >> cash; std::cout << std::endl;
 
    if(atm.giveMoney(cash, m_ATM_count_50, m_ATM_count_100, m_ATM_count_1000))
    {
        std::cout << "Issued by: "
                  << "50 bills: " << m_ATM_count_50
                  << "50 bills: " << m_ATM_count_100
                  << "50 bills: " << m_ATM_count_1000 << std::endl;
    }
    else
    {
        std::cout << "Insufficient funds" << std::endl;
    }
 
    return 0;
}